Microswitches MS Series

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1 General purpose microswitches for heavier duty applications High precision snap action mechanism 16A 250V AC resistive rating (I th ) Wide range of actuator styles Screw terminals with self lifting plate 10 million mechanical operation cycles Protection degree IP20, IP40 or IP65 Versions with positive opening Mechanically interchangeable with previous products (see cross reference section) UL and cul Approvals Options & Ordering Codes MS ST C1 1 D A01 G Terminal Type Screw terminals with self-lifting plate ST Contacts Type Contact Block 1NO+NC, snap action C1 G Silver contacts (standard) Silver contacts gold plated 1 μm Max. Protection Degree Actuator (see following pages) IP40 (with protection) IP65 (with protection) Actuation Type Direct action Back direct action Inverted action 1 2 D B R A01 A02 A03 With pin With pin With small push button..... ATTENTION! The feasability of a code number does not mean the effective availability of a product. There are other options possible, if you can not see the option you require please contact IMO.

2 Introduction The MS series of microswitches has been developed with added features to replace the existing MV range. The main features of the new range have been kept the same as the existing MV range to allow for interchangeability. However, extra features have increased the application eld where these switches can be used. The innovative feature of this series is the tripping device which has evolved with the use of modern technology, allowing added features that oer a higher number of solutions when compared with similar devices currently present in the market. The contacts of the new MS range have a higher reliability factor which has been achieved with the use of double contacts which are also used where positive opening of the contact is required. The housing has been designed so a gasket can be added as an option in order to seal the device against fine dust or liquids up to IP65. The terminals are more practical and allow for connection of a wider range of cable diameters. There are also options available with Fast-On terminals, with the choice of three dierent terminal exit angles. Contact Block Reliability In the following table we refer to the typical microswitch contact structure (type A) normally used in the industry, compared with the innovative solution that IMO Precision Controls uses in new MS series microswitches: movable contact with single interruption and double contacts (type B). As you can see from the table below, this last structure (type B) offers half of the contact resistance (R) than the simple mobile contact (type A) and a lower probability of failure ( fe). In fact, defined x the probability of a commutation failure of a single interruption, it results that in the type A the failure probability fe=x, in the type B the probability fe= x 2. This means that if in a certain situation the failure probability x is equal, for instance, to 1 x 10-4 (1 failed interruption every ), we will have: - in type A one failed commutation every in type B one failed commutation every Extended Temperature Range On request the new MS series are also available with an extended temperature range. Where the IMO standard MS microswitches have a temperature range of -25 C +85 C to, these special versions can be used in places where the ambient temperature changes from -40 C to +85 C leading to possible installation inside cold stores, sterilizers or other equipment using very low ambient temperatures. Special materials have been used to realize these versions and these allow the specications and features to remain unchanged under these conditions, thereby widening the installation possibilities. To have this option, add suffix H6 to the part number. Microswitches For Safety Applications All microswitches that have for safety applications. beside the part number have a positive opening mechanism therefore suitable These microswitches are provided with a rigid connection between the actuating plunger and the NC contacts, which means these are opened by force through a strong/sturdy internal safety lever. The positive opening is in conformity with the IEC standard and as such these microswitches are suitable for installation in protection application.

3 Protection Degree IP20 By installing microswitches type MSSTC11xxx with terminal cover AC-C01 it is possible to obtain a microswitch that is IP20. Protection Degree IP40 By installing microswitch types MSSTC11xxx with terminal cover AC-C02 it is possible to obtain a microswitch that is IP40. Protection Degree IP65 By installing microswitch types MSSTC12xxx (not stocked) with terminal covers AC-MSCV22 or AC-MSCV23 it is possible to obtain a microswitch that is dustproof and waterproof and hence achieve IP65. Clamping Screw Terminal For Different Size Cable The clamping mechanism of the MS microswitches has been designed to allow for connection of dierent diameter cables. The clamping plate is designed in such a way to force the cable towards the screw hence achieving the most robust termination possible for all cable sizes within its specication. Terminal Covers With Cable Gland Entry Terminal covers can be supplied that incorporate a trap cable gland to achieve a protection level up to IP65. These terminal covers are snap-in assembled and when used increase the size of the microswitch. The use of these covers can also be extended to installations where a number of microswitches are clamped together. Rotating Actuators The microswitches have been designed to allow the user to rotate the actuator head (roller plunger types only) by 90 steps and this is possible by removing the holding screws, rotating the head and then retting the screws back.

4 Technical Data Housing: Made of glass-reinforced polymer, self-extinguishing, shock-proof thermoplastic resin. Protection degree: IP20 (with protection AC-C01 - AC-C03) IP40 (with protection AC-MSCV 1 - AC-C02) IP65 (with protection AC-MSCV 22 - AC-MSCV 23) according to EN General Data: Ambient temperature: from -25 C to +85 C (-40oC option) Max operating frequency: 3600 operations cycles 1/hour Mechanical endurance: 10 million operations cycles 1 (1) One operation cycle means two movements, one to close and one to open contacts, as foreseen by EN standard. Main data Polymer housing High reliability contacts Protection degree IP20, IP40 or IP65 4 terminal types available 47 actuators available Versions with positive opening Silver contacts gold plated versions Terminal covers with wire trap cable gland Mechanically interchangeable with previous products (see cross reference section) Markings & Quality Marks Cross Section Of The Conductors (flexible copper wire): MS Series: min. 1 x 0,34 mm 2 (1 x AWG 22) max 2 x 1,5 mm 2 (2 x AWG 16) In Conformity With Standards: IEC , EN , IEC 60529, EN Approvals: UL508 In Conformity With Requirements Requested By: Low Voltage Directive 2006/95/EC, Machinery Directive 2006/42/EC and Electromagnetic Compatibility 2004/108/EC. Positive Contact Opening In Conformity With Standards: IEC , EN , EN , VDE Installation for safety applications: Use only switches marked with the symbol. The safety circuit must always be connected with the NC contacts (normally closed contacts) as stated in the standard EN , encl. K, par. 2. The switch must be actuated by a travel length that is at least up to the positive opening travel (POT) value of which is listed near the code article. The switch must be actuated at least with the positive opening force (POT), value of which is listed near the code article. Electrical Data: Thermal current (Ith): 16 A Rated insulation voltage (Ui): 250 Vac 300 Vdc Conditional shot circuit current: 1000 A according to EN Protection against short circuits: fuse 10 A 500 V type gg Pollution degree: 3 Dielectric strength: 2000 Vac/min. Utilisation Categories: Alternate current: AC15 ( Hz) Ue (V) Ie (A) 6 6 Direct current: DC13 Ue (V) Ie (A) 5 0,6 0,3 Data Type Approved By UL: Utilisation categories: Q300 (69 VA, Vdc) A300 (720 VA, Vac) In conformity with standard: UL 508

5 Terminal Outline Dimension Fixing Tighten the nut 1 with torque Nm. Tighten the screws 4 with torque Nm. Tighten the screws 2 with torque Nm. Tighten the nut 3 M4 with torque Nm. NOTE: a torque higher than 1.2 Nm may cause the microswitch to break. Wiring Dimension With direct and back direct action [B, D] With inverted action [R] MD PT OF Differential Travel Pre-Travel Operating Force OT POT MD Over-Travel Positive Opening Travel Movement Differential RF POF Releasing Force Positive Opening Force Microswitches With Direct Action 10pcs per pack MSSTC11DA01 PT 0.5mm OF 4 N 1NO+1NC OT 1.5mm RF 3 N MD 0.5mm MSSTC11DA02 PT 0.5mm OF 4 N 1NO+1NC OT 2mm RF 3 N MD 0.05mm MSSTC11DA03 PT 0.5mm OF 4 N 1NO+1NC OT 2mm RF 3 N MD 0.5mm MSSTC11DA04 PT 0.5mm OF 4 N 1NO+1NC OT 2mm RF 3 N MD 0.05mm

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8 Cross Reference Terminal Protection Covers 10 pcs per pack Terminal protection cover for screw terminals snap-in assembled and with wire trap cable gland. It allows the installation of more switches side by side. Terminal protection cover for vertical faston terminals snap-in assembled and with wire trap cable gland. It allows the installation of more switches side by side. Article Description Protection Degree Article Description Protection Degree AC-MSCV12 Terminal protection cover without gasket for multipolar cables from Ø 4 to Ø 7,5 mm IP40 AC-MSCH12 Terminal protection cover without gasket for multipolar cables from Ø 4 to Ø 7,5 mm IP40 AC-MSCV22 Terminal protection cover without gasket for multipolar cables from Ø 4 to Ø 7,5 mm IP65 AC-MSCV23 Terminal protection cover without gasket for multipolar cables from Ø 4 to Ø 7,5 mm IP65 Article Description Protection Degree Article Description Protection Degree AC-C01 Terminal protection cover for screw terminals IP20 AC-C02 Terminal protection cover for screw terminals with cable gland PG9 for multipolar cables from Ø 5 to Ø 7 mm IP40 Ref:MS-0715v2 Errors and omissions excepted. Subject to change without notice.